decide on the instance of class really used at runtime

Hello:
I need to ask something form the Pb and then wrap the result of the query as an object and I have several types of mark, so I tried to extract them by using the extension mechanism.

----------------------------------
abstract class AbstractExecutor {
     public String     sql;
     public abstract String execut();
}
class UserExecutor extends AbstractExecutor {
     @Override
     public String execut() {
          ArrayList<User> resList = new ArrayList<User>();
          sql = "select username from user";
          // user the sql to query from db
          ResultSet rs = null;//
          // iterative the rs, make each record to a User object and put it to the
          // list:someting like that:
          User u = new User("This argument coms from the db");
          resList.add(u);
          // build the result string by the resList, here I just call its toString
          // method for example.
          return resList.toString();
     }
     static class User {
          String     name;
          public User(String name) {this.name = name;}
     }
}
class MessageExecutor extends AbstractExecutor {
     @Override
     public String execut() {
          ArrayList<Message> resList = new ArrayList<Message>();
          sql = "select title from message";
          // use the sql to query from db
          ResultSet rs = null;//
          // iterative the rs, make each record to a Message object and put it to
          // the list:someting like that:
          Message u = new Message("This argument coms from the db");
          resList.add(u);
          // build the result string by the resList, here I just call its toString
          // method for example.
          return resList.toString();
     }

     static class Message {
          String     title;
          public Message(String title) {this.title = title;}
     }

}

public class Client {
     public static void main(String[] args) {
          Map<String, AbstractExecutor> map = new HashMap<String, AbstractExecutor>();
          map.put("1", new UserExecutor());
          map.put("2", new MessageExecutor());

          // get the parameter from request...
          int type = 2;
          map.get(type + "").execut();
     }
}
--------------------------------------

Of course the steps in the logic of two bussiness (the UserExecutor and the MessageExecutor) are then same with the others, the only difference is the 'sql' and the 'class' used for wraped the result (the user and the Message)
so I'm wondering, can I extract the same logic to their superclass (AbstractExecutor)?

I tried generics:
--------------------------------------
abstract class AbstractExecutor<E> {
     public String     queryFields[]={};
     public String execut(){
          ArrayList<E> resList = new ArrayList<E>();
          sql = "select "+queryFields[0]+" from "+queryFields[1];
          // use the sql to query from db
          ResultSet rs = null;//
          // iterative the rs, make each record to a E object and put it to
          // the list,someting like that:
          E e = ? // here how to make a instance of E(a User object or a Message object)?
          resList.add(e);
          // build the result string by the resList, here I just call its toString
          // method for example.
          return resList.toString();
     }
}
If the above work, the UserExecutor can be like this:
class UserExecutor extends AbstractExecutor<User> {
     //just override the fields of its superclass.
     queryFields={"username","user"};
}
class User{
          String     name;
          public Message(String name) {this.name = name;}
}
I wonder if it's possible? If generic manufacturers cannot operate, are there other ways to do this?
What I want to really reduced repetitive codes and makes stretch, since I can add another executor in the future.

Your example is simplistic in that the business logic of 'client' (ArrayList.toString ()) depends on the type of the objects in the list.
With this in mind...

I wonder if it's possible?

Yes, just replace the question mark with a call to abstract method (Note: which highlights the model Template methodGoF):

abstract class AbstractExecutor {
     protected abstract E createInstanceOfContent(ResultSet rs);

    public String execut(){
      ArrayList resList = new ArrayList();
      sql = "select "+queryFields[0]+" from "+queryFields[1];
      // use the sql to query from db
      ResultSet rs = null;//
      // iterative the rs, make each record to a E object and put it to
      // the list,someting like that:
      E e = createInstanceOfContent(rs);
      resList.add(e);
      // build the result string by the resList, here I just call its toString
}

class UserExecutor extends AbstractExecutor {
      protected User createInstanceOfContent(ResultSet rs) {
        User user = new User();
        user.setName(...);
        return user;
    }
}

are there other ways to do this?

Your executor abstract is not really taking advantage of security of generic type, so you could do it with simple inheritance:

abstract class AbstractExecutor{
    protected abstract Object createInstanceOfContent(ResultSet rs);

    public String execute(){
      ArrayList resList = new ArrayList();
      sql = "select "+queryFields[0]+" from "+queryFields[1];
      // use the sql to query from db
      ResultSet rs = null;//
      // iterative the rs, make each record to a E object and put it to
      // the list,someting like that:
      E e = createInstanceOfContent(rs);
      resList.add(e);
      // build the result string by the resList, here I just call its toString
}

class UserExecutor extends AbstractExecutor {
      protected Object createInstanceOfContent(ResultSet rs) {
        User user = new User();
        user.setName(...);
        return user;
    }
}

What I want to really reduced repetitive codes and makes stretch, since I can add another executor in the future.

Good intention. Try to identify the operations that are common to all types of executor (for example, the creation of some entity, storage in a collection, iteration over the collection,...) and ask if they take advantage of a common interface of the manipulated entities (your example does not show that).

For your information, Spring 'JDBC' or 'DAO' API, I don't remember the name, introduced models this kind of logic for awhile now. Even if you do not use Spring as a framework for Dependency Injection, spring-jdbc library is worth the visit.

Tags: Oracle

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